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利用一种新材料(E)-2-(2-(9-ethyl-9H-carbazol-3-yl)vinyl)quinolato-Zinc(CzHQZn)作空穴传输层和发光层制备了白光有机电致发光器件(WOLED),器件的结构为indium-tin oxide(ITO)/4,4′,4′′-{N,-(2-naphthyl)-N-phenylamino}-triphenylamine(2T-NATA)(22 nm)/CzHQZn(xnm)/N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine(NPBX)(ynm)/2,9-dimethyl,-4,7-diaphenyl,1,10-phenanthroline(BCP)(10nm)/tris(8-quinolinolato)aluminum(Alq3)(68-x-ynm)/LiF(0.5 nm)/Al。研究发现发光层CzHQZn和NPBX的厚度对器件的发光性能有较大的影响。当CzHQZn厚度x为22 nm、NPBX厚度y为8 mm时,得到了色度最好和效率最大的WOLED,最大电流效率为0.9 cd/A(at 10 V),最大亮度为3514 cd/m2(at 10 V),此时色坐标为(0.3579,0.3182),接近白光的等能点(0.33,0.33)。器件的另一个重要特点是开启电压比较低为4 V。
The white light organic electroluminescence was prepared by using a novel material (E-2- (2- (2- (2- (2- (2- The structure of the device is indium-tin oxide (ITO) / 4,4 ’, 4 "- {2-naphthyl) -N-phenylamino} -triphenylamine (2T- NATA) ) / CzHQZn (xnm) / N, N’-bis- (1-naphthyl) -N, N’-diphenyl- 1,1’-biphenyl-4,4’-diamine (NPBX) (BCP) (10 nm) / tris (8-quinolinolato) aluminum (Alq3) (68-x-ynm) / LiF (0.5 nm) / Al. It is found that the thickness of CzHQZn and NPBX have a great influence on the luminescent properties of the device. When CzHQZn thickness x was 22 nm and NPBX thickness y was 8 mm, the best and most efficient WOLED was obtained with a maximum current efficiency of 0.9 cd / A (at 10 V) and a maximum brightness of 3514 cd / m2 at 10 V). At this time, the color coordinates are (0.3579, 0.3182), which are close to the isopotential points of white light (0.33,0.33). Another important feature of the device is a 4 V lower start-up voltage.